Removed around 1971, most likely during agricultural clearance of the tillage field it occupied, the stone left no visible trace on the ground, and there is nothing at the site today to mark where it once was. That absence is itself quietly telling: prehistoric standing stones, single upright blocks erected across Ireland during the Bronze Age, were a persistent enough feature of the landscape that farmers worked around them for centuries, and the ones that disappeared in the mid-twentieth century often did so in a concentrated burst of land improvement that swept away features which had survived millennia.

What makes the Knocknabehy stone particularly elusive is its cartographic history. It does not appear on the Ordnance Survey six-inch maps of 1842 or 1904, which recorded the Irish landscape in considerable detail and routinely marked antiquities of this kind. Yet by 1937 it had been noted on a later revision of the same map series as a single standing stone on an east-facing slope. Whether it was simply overlooked in the earlier surveys, or whether the 1937 surveyors were working from local knowledge that their predecessors had missed, is not recorded. That roughly ninety-year window between the first mapping and its appearance in the cartographic record adds another layer of uncertainty to a monument that is, in any case, now gone.